Nitmiluk or Katherine Gorge was created by the eroding effect of the river water. Tens of thousands of years ago the water flowed on the surface of the surrounding land. The water level can easily rise 10 metres during the wet season.
Katherine Gorge borders on Arnhemland and functions as a sort of water buffer for this area. Arnhemland is a mainly aboriginal area. It is an upland plain which goes on to the ocean in the utmost north of Australia.
The water in the gorge is fresh. The crocodiles which live here are freshwater crocodiles. They are less dangerous than their saltwater cousins. They usually avoid humans.
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